MyBatis练习:统计每日比赛胜负场次
2017-06-05 18:51
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我的电脑操作系统版本为Win7旗舰版(ServicePack1),Oracle版本为Oracle11g
程序使用的jar包有:mybatis-3.2.2.jar、ojdbc14-10.2.0.2.0.jar
本例中使用的配置文件mybatis-config.xml,可以参见我的另一篇Blog《一个简单的MyBatis连接Oracle数据库的例子》(http://my.oschina.net/Tsybius2014/blog/626206)
现在Oracle数据库中建立一个新表GAME_RECORD并插入一些数据,SQL如下:
数据表建立后,从PL/SQL上查询到的结果集如下:
![](http://static.oschina.net/uploads/space/2016/0316/134644_z6NN_1425762.png)
现在我们要做的,是统计出玩家Tsybius每日的胜(WIN)、负(LOSE)和平局(DRAW)场次
在PL/SQL中,我先写了一个SQL:
这个SQL的查询结果如下:
![](http://static.oschina.net/uploads/space/2016/0316/135038_SW0m_1425762.png)
现在将这个SQL语句移植到MyBatis中,main函数调用代码如下:
GameRecordMapper.java代码如下:
GameRecordMapper.xml代码如下:
程序运行时,输出到控制台中的代码如下:
END
程序使用的jar包有:mybatis-3.2.2.jar、ojdbc14-10.2.0.2.0.jar
本例中使用的配置文件mybatis-config.xml,可以参见我的另一篇Blog《一个简单的MyBatis连接Oracle数据库的例子》(http://my.oschina.net/Tsybius2014/blog/626206)
现在Oracle数据库中建立一个新表GAME_RECORD并插入一些数据,SQL如下:
CREATE TABLE GAME_RECORD ( ID NUMBER(12, 0) PRIMARY KEY, GAME_DATE NUMBER(10, 0), PLAYER_NAME VARCHAR(10), GAME_RESULT VARCHAR(10) ); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (1, 20160301, 'Tsybius', 'WIN'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (2, 20160301, 'Tsybius', 'LOSE'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (3, 20160301, 'Tsybius', 'LOSE'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (4, 20160302, 'Tsybius', 'WIN'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (5, 20160302, 'Tsybius', 'WIN'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (6, 20160302, 'Tsybius', 'LOSE'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (7, 20160302, 'Tsybius', 'DRAW'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (8, 20160302, 'Tsybius', 'WIN'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (9, 20160302, 'Tsybius', 'LOSE'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (10, 20160303, 'Tsybius', 'WIN'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (11, 20160303, 'Tsybius', 'DRAW'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (12, 20160303, 'Quintus', 'WIN'); INSERT INTO GAME_RECORD (ID, GAME_DATE, PLAYER_NAME, GAME_RESULT) VALUES (13, 20160303, 'Quintus', 'WIN'); COMMIT; /
数据表建立后,从PL/SQL上查询到的结果集如下:
![](http://static.oschina.net/uploads/space/2016/0316/134644_z6NN_1425762.png)
现在我们要做的,是统计出玩家Tsybius每日的胜(WIN)、负(LOSE)和平局(DRAW)场次
在PL/SQL中,我先写了一个SQL:
SELECT DT.GAME_DATE, NVL(WN.WIN_CNT, 0) AS WIN, NVL(LS.LOSE_CNT, 0) AS LOSE, NVL(DRW.DRAW_CNT, 0) AS DRAW FROM ((SELECT GAME_DATE FROM GAME_RECORD WHERE PLAYER_NAME = 'Tsybius' GROUP BY GAME_DATE) DT LEFT JOIN (SELECT GAME_DATE, COUNT(*) AS WIN_CNT FROM GAME_RECORD WHERE GAME_RESULT = 'WIN' AND PLAYER_NAME = 'Tsybius' GROUP BY GAME_DATE) WN ON DT.GAME_DATE = WN.GAME_DATE LEFT JOIN (SELECT GAME_DATE, COUNT(*) AS LOSE_CNT FROM GAME_RECORD WHERE GAME_RESULT = 'LOSE' AND PLAYER_NAME = 'Tsybius' GROUP BY GAME_DATE) LS ON DT.GAME_DATE = LS.GAME_DATE LEFT JOIN (SELECT GAME_DATE, COUNT(*) AS DRAW_CNT FROM GAME_RECORD WHERE GAME_RESULT = 'DRAW' AND PLAYER_NAME = 'Tsybius' GROUP BY GAME_DATE) DRW ON DT.GAME_DATE = DRW.GAME_DATE) ORDER BY DT.GAME_DATE
这个SQL的查询结果如下:
![](http://static.oschina.net/uploads/space/2016/0316/135038_SW0m_1425762.png)
现在将这个SQL语句移植到MyBatis中,main函数调用代码如下:
import java.io.InputStream; import java.util.Iterator; import java.util.List; import java.util.Map; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; /** * MyBatis使用测试 * @author Tsybius2014 * @date 2016年3月16日 * @time 下午1:55:28 * @remark * */ public class MyBatisTest { public static void main(String[] args) { try { String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); SqlSession session = sqlSessionFactory.openSession(); try { GameRecordMapper mapper = session.getMapper(GameRecordMapper.class); //获取每日胜、负、平局场次 List<Map<String, Object>> gameLogList = mapper.getGameLog("Tsybius"); Iterator<Map<String, Object>> iter = gameLogList.iterator(); while (iter.hasNext()) { Map<String, Object> gameLog = iter.next(); System.out.println(gameLog); } } finally { session.close(); } } catch (Exception ex) { ex.printStackTrace(); } } }
GameRecordMapper.java代码如下:
import java.util.List; import java.util.Map; public interface GameRecordMapper { /** * 获取指定选手每日胜、负、平局的场次统计信息 * @param playerName 选手名 * @return */ List<Map<String, Object>> getGameLog(String playerName); }
GameRecordMapper.xml代码如下:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="GameRecordMapper"> <resultMap id="GameLogMap" type="java.util.Map" > <result column="GAME_DATE" property="gameDate" jdbcType="DECIMAL" /> <result column="WIN" property="win" jdbcType="DECIMAL" /> <result column="LOSE" property="lose" jdbcType="DECIMAL" /> <result column="DRAW" property="draw" jdbcType="DECIMAL" /> </resultMap> <sql id="Calc_Win_Times" > SELECT GAME_DATE, COUNT(*) AS WIN_CNT FROM GAME_RECORD WHERE GAME_RESULT = 'WIN' AND PLAYER_NAME = #{playerName, jdbcType = VARCHAR} GROUP BY GAME_DATE </sql> <sql id="Calc_Lose_Times" > SELECT GAME_DATE, COUNT(*) AS LOSE_CNT FROM GAME_RECORD WHERE GAME_RESULT = 'LOSE' AND PLAYER_NAME = #{playerName, jdbcType = VARCHAR} GROUP BY GAME_DATE </sql> <sql id="Calc_Draw_Times" > SELECT GAME_DATE, COUNT(*) AS DRAW_CNT FROM GAME_RECORD WHERE GAME_RESULT = 'DRAW' AND PLAYER_NAME = #{playerName, jdbcType = VARCHAR} GROUP BY GAME_DATE </sql> <select id="getGameLog" parameterType="java.lang.String" resultMap="GameLogMap" > SELECT DT.GAME_DATE, NVL(WN.WIN_CNT, 0) AS WIN, NVL(LS.LOSE_CNT, 0) AS LOSE, NVL(DRW.DRAW_CNT, 0) AS DRAW FROM ((SELECT GAME_DATE FROM GAME_RECORD WHERE PLAYER_NAME = #{playerName, jdbcType = VARCHAR} GROUP BY GAME_DATE) DT LEFT JOIN (<include refid="Calc_Win_Times" />) WN ON DT.GAME_DATE = WN.GAME_DATE LEFT JOIN (<include refid="Calc_Lose_Times" />) LS ON DT.GAME_DATE = LS.GAME_DATE LEFT JOIN (<include refid="Calc_Draw_Times" />) DRW ON DT.GAME_DATE = DRW.GAME_DATE) ORDER BY DT.GAME_DATE </select> </mapper>
程序运行时,输出到控制台中的代码如下:
{gameDate=20160301, lose=2, draw=0, win=1} {gameDate=20160302, lose=2, draw=1, win=3} {gameDate=20160303, lose=0, draw=1, win=1}
END
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